Could a superearth be hospitable (survivable?) for humans?

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Drakkith said:
You know, I've never really thought much about immunity vs local organisms. I suppose its possible, if not probable, for either ourselves to be completely immune to practically everything on the planets, or extremely vulnerable to said organisms?

If you can't digest it, it can't digest you.

Basic rule of space exploration.
 
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ImaLooser said:
If you can't digest it, it can't digest you.

Basic rule of space exploration.
Please provide a source (or at least a good reason) for that claim.

Here are counterexamples to take into account:
We can digest plants, but how can plants digest us?
Viruses can digest us, but how can we digest viruses?